[PATCH] M68k update (part 42)

M68k task and thread updates

4 files changed, 127 insertions, 43 deletions

diff --git a/include/asm-m68k/entry.h b/include/asm-m68k/entry.h
index c35ec2e45aa6..ab9cd8c80af2 100644
--- a/include/asm-m68k/entry.h
+++ b/include/asm-m68k/entry.h
@@ -111,6 +111,7 @@ PT_DTRACE_BIT = 2
 	movel	%sp,\reg
 	andw	#-THREAD_SIZE,\reg
 	movel	\reg,%curptr
+	movel	%curptr@,%curptr
 .endm
 
 #else /* C source */
diff --git a/include/asm-m68k/processor.h b/include/asm-m68k/processor.h
index 7ba60318ce28..864e69653644 100644
--- a/include/asm-m68k/processor.h
+++ b/include/asm-m68k/processor.h
@@ -59,11 +59,16 @@ extern inline void wrusp(unsigned long usp) {
 #define EISA_bus 0
 #define MCA_bus 0
 
-/* 
- * if you change this structure, you must change the code and offsets
- * in m68k/machasm.S
- */
-   
+struct task_work {
+	unsigned char sigpending;
+	unsigned char notify_resume;	/* request for notification on
+					   userspace execution resumption */
+	char          need_resched;
+	unsigned char delayed_trace;	/* single step a syscall */
+	unsigned char syscall_trace;	/* count of syscall interceptors */
+	unsigned char pad[3];
+};
+
 struct thread_struct {
 	unsigned long  ksp;		/* kernel stack pointer */
 	unsigned long  usp;		/* user stack pointer */
@@ -76,11 +81,13 @@ struct thread_struct {
 	unsigned long  fp[8*3];
 	unsigned long  fpcntl[3];	/* fp control regs */
 	unsigned char  fpstate[FPSTATESIZE];  /* floating point state */
+	struct task_work work;
 };
 
-#define INIT_THREAD  { \
-	sizeof(init_stack) + (unsigned long) init_stack, 0, \
-	PS_S, __KERNEL_DS, \
+#define INIT_THREAD  {						\
+	ksp: sizeof(init_stack) + (unsigned long) init_stack,	\
+	sr: PS_S, 						\
+	fs: __KERNEL_DS,					\
 }
 
 /*
@@ -117,21 +124,7 @@ static inline void exit_thread(void)
 {
 }
 
-/*
- * Return saved PC of a blocked thread.
- */
-extern inline unsigned long thread_saved_pc(struct thread_struct *t)
-{
-	extern void scheduling_functions_start_here(void);
-	extern void scheduling_functions_end_here(void);
-	struct switch_stack *sw = (struct switch_stack *)t->ksp;
-	/* Check whether the thread is blocked in resume() */
-	if (sw->retpc > (unsigned long)scheduling_functions_start_here &&
-	    sw->retpc < (unsigned long)scheduling_functions_end_here)
-		return ((unsigned long *)sw->a6)[1];
-	else
-		return sw->retpc;
-}
+extern unsigned long thread_saved_pc(struct task_struct *tsk);
 
 unsigned long get_wchan(struct task_struct *p);
 
@@ -144,17 +137,6 @@ unsigned long get_wchan(struct task_struct *p);
 	eip; })
 #define	KSTK_ESP(tsk)	((tsk) == current ? rdusp() : (tsk)->thread.usp)
 
-#define THREAD_SIZE (2*PAGE_SIZE)
-
-/* Allocation and freeing of basic task resources. */
-#define alloc_task_struct() \
-	((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
-#define free_task_struct(p)	free_pages((unsigned long)(p),1)
-#define get_task_struct(tsk)      atomic_inc(&virt_to_page(tsk)->count)
-
-#define init_task	(init_task_union.task)
-#define init_stack	(init_task_union.stack)
-
 #define cpu_relax()	do { } while (0)
 
 #endif
diff --git a/include/asm-m68k/system.h b/include/asm-m68k/system.h
index efc5ab8ff507..cead336436ca 100644
--- a/include/asm-m68k/system.h
+++ b/include/asm-m68k/system.h
@@ -7,7 +7,10 @@
 #include <asm/segment.h>
 #include <asm/entry.h>
 
-#define prepare_to_switch()	do { } while(0)
+#define prepare_arch_schedule(prev)		do { } while(0)
+#define finish_arch_schedule(prev)		do { } while(0)
+#define prepare_arch_switch(rq)			do { } while(0)
+#define finish_arch_switch(rq)			spin_unlock_irq(&(rq)->lock)
 
 /*
  * switch_to(n) should switch tasks to task ptr, first checking that
@@ -32,19 +35,16 @@
  * 02/17/96 - Jes Sorensen (jds@kom.auc.dk)
  *
  * Changed 96/09/19 by Andreas Schwab
- * pass prev in a0, next in a1, offset of tss in d1, and whether
- * the mm structures are shared in d2 (to avoid atc flushing).
+ * pass prev in a0, next in a1
  */
 asmlinkage void resume(void);
-#define switch_to(prev,next,last) { \
+#define switch_to(prev,next,last) do { \
   register void *_prev __asm__ ("a0") = (prev); \
   register void *_next __asm__ ("a1") = (next); \
-  register void *_last __asm__ ("d1"); \
   __asm__ __volatile__("jbsr resume" \
-		       : "=d" (_last) : "a" (_prev), "a" (_next) \
-		       : "d0", /* "d1", */ "d2", "d3", "d4", "d5", "a0", "a1"); \
-  (last) = _last; \
-}
+		       : : "a" (_prev), "a" (_next) \
+		       : "d0", "d1", "d2", "d3", "d4", "d5", "a0", "a1"); \
+} while (0)
 
 
 /* interrupt control.. */
diff --git a/include/asm-m68k/thread_info.h b/include/asm-m68k/thread_info.h
new file mode 100644
index 000000000000..64c9f51e0c63
--- /dev/null
+++ b/include/asm-m68k/thread_info.h
@@ -0,0 +1,101 @@
+#ifndef _ASM_M68K_THREAD_INFO_H
+#define _ASM_M68K_THREAD_INFO_H
+
+#include <asm/types.h>
+#include <asm/processor.h>
+#include <asm/page.h>
+
+struct thread_info {
+	struct task_struct	*task;		/* main task structure */
+	struct exec_domain	*exec_domain;	/* execution domain */
+	__s32			preempt_count; /* 0 => preemptable, <0 => BUG */
+	__u32 cpu; /* should always be 0 on m68k */
+
+	__u8			supervisor_stack[0];
+};
+
+#define PREEMPT_ACTIVE		0x4000000
+
+#define INIT_THREAD_INFO(tsk)			\
+{						\
+	task:		&tsk,			\
+	exec_domain:	&default_exec_domain,	\
+}
+
+/* THREAD_SIZE should be 8k, so handle differently for 4k and 8k machines */
+#if PAGE_SHIFT == 13 /* 8k machines */
+#define alloc_thread_info()   ((struct thread_info *)__get_free_pages(GFP_KERNEL,0))
+#define free_thread_info(ti)  free_pages((unsigned long)(ti),0)
+#else /* otherwise assume 4k pages */
+#define alloc_thread_info()   ((struct thread_info *)__get_free_pages(GFP_KERNEL,1))
+#define free_thread_info(ti)  free_pages((unsigned long)(ti),1)
+#endif /* PAGE_SHIFT == 13 */
+
+#define init_thread_info	(init_thread_union.thread_info)
+#define init_stack		(init_thread_union.stack)
+
+#define current_thread_info()	(current->thread_info)
+
+
+#define __HAVE_THREAD_FUNCTIONS
+
+#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
+#define TIF_DELAYED_TRACE	1	/* single step a syscall */
+#define TIF_NOTIFY_RESUME	2	/* resumption notification requested */
+#define TIF_SIGPENDING		3	/* signal pending */
+#define TIF_NEED_RESCHED	4	/* rescheduling necessary */
+
+extern int thread_flag_fixme(void);
+
+/*
+ * flag set/clear/test wrappers
+ * - pass TIF_xxxx constants to these functions
+ */
+
+#define __set_tsk_thread_flag(tsk, flag, val) ({ 	\
+	switch (flag) {					\
+	case TIF_SIGPENDING:				\
+		tsk->thread.work.sigpending = val;	\
+		break;					\
+	case TIF_NEED_RESCHED:				\
+		tsk->thread.work.need_resched = val;	\
+		break;					\
+	default:					\
+		thread_flag_fixme();			\
+	}						\
+})
+
+#define __get_tsk_thread_flag(tsk, flag) ({		\
+	int ___res;					\
+	switch (flag) {					\
+	case TIF_SIGPENDING:				\
+		___res = tsk->thread.work.sigpending;	\
+		break;					\
+	case TIF_NEED_RESCHED:				\
+		___res = tsk->thread.work.need_resched;	\
+		break;					\
+	default:					\
+		___res = thread_flag_fixme();		\
+	}						\
+	___res;						\
+})
+
+#define __get_set_tsk_thread_flag(tsk, flag, val) ({	\
+	int __res = __get_tsk_thread_flag(tsk, flag);	\
+	__set_tsk_thread_flag(tsk, flag, val);		\
+	__res;						\
+})
+
+#define set_tsk_thread_flag(tsk, flag) __set_tsk_thread_flag(tsk, flag, ~0)
+#define clear_tsk_thread_flag(tsk, flag) __set_tsk_thread_flag(tsk, flag, 0)
+#define test_and_set_tsk_thread_flag(tsk, flag) __get_set_tsk_thread_flag(tsk, flag, ~0)
+#define test_tsk_thread_flag(tsk, flag) __get_tsk_thread_flag(tsk, flag)
+
+#define set_thread_flag(flag) set_tsk_thread_flag(current, flag)
+#define clear_thread_flag(flag) clear_tsk_thread_flag(current, flag)
+#define test_thread_flag(flag) test_tsk_thread_flag(current, flag)
+
+#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
+#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
+
+#endif	/* _ASM_M68K_THREAD_INFO_H */